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[DavidBriscoe <kalos.dev@xxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I recently upgraded Ibex to Jaunty on my Dell Inspiron 6400. After the
upgrade, graphics were really slow (lag when scrolling in Firefox,
opening menus) and I couldn't play movies (Totem, VLC...).

I tried this:
    sudo dpkg-reconfigure xserver-xorg
And selected all defaults except for "use kernel frame buffer device interface", which I switched to yes.
(This screen: http://www.freesoftwaremagazine.com/files/www.freesoftwaremagazine.com/nodes/2540/dpkg_figure_5.jpg )

Now my graphics work. The screen says that it's probably safe to turn it
on, so why wasn't it enabled by default (or autodetected)? I looked
through my previous xorg.conf files and it wasn't enabled before, so I
guess it was some of the Jaunty graphic updates that required the
change.

One other detail: When I was using Ibex, the fancy Visual Effects
(compiz) worked. Now they don't. I think they stopped working before the
upgrade, but I'm not certain.

Debug info:
$ lsb_release -rd
Description:	Ubuntu 9.04
Release:	9.04

$ uname -a
Linux blank 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux

$ apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.6.3-0ubuntu9
  Candidate: 2:2.6.3-0ubuntu9
  Version table:
 *** 2:2.6.3-0ubuntu9 0
        500 http://ca.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status

$ lspci -vvnn | grep -A 12 -e "VGA "
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
	Subsystem: Dell Device [1028:01bd]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at dff00000 (32-bit, non-prefetchable) [size=512K]
	Region 1: I/O ports at eff8 [size=8]
	Region 2: Memory at c0000000 (32-bit, prefetchable) [size=256M]
	Region 3: Memory at dfec0000 (32-bit, non-prefetchable) [size=256K]
	Capabilities: <access denied>
	Kernel modules: intelfb

$ cat /etc/X11/xorg.conf
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#[snip comments]
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Device"
	Identifier	"Configured Video Device"

# this line fixes it
	Option		"UseFBDev"		"true"
# end line
EndSection

Section "Monitor"
	Identifier	"Configured Monitor"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Monitor		"Configured Monitor"
	Device		"Configured Video Device"
EndSection

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: framebuffer intel slow

-- 
[Jaunty] Slow intel graphics --> doesn't autodetect UseFBDev
https://bugs.launchpad.net/bugs/373780
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